udev causing "Cannot Display the Video Mode" on flat panel

[Kam Leo]

On 5/1/07, Edward DeMeulle <ed at demeulle.org> wrote:
> On 5/1/07 10:17, Mikkel L. Ellertson wrote:
> > Edward DeMeulle wrote:
> >
> >> After fresh installing Fedora 6 just after udev starts the screen goes
> >> blank and displays the above message. Neither setting runlevel 3 in GRUB
> >> nor Ctrl-Alt-F1,F2, etc. restore the screen. I do have ssh access and
> >> can even do Ctrl-Alt-F1 and blindly login. So now what? Apparently udev
> >> is either causing the video card to set itself to an unusual mode or
> >> it's forcing it to use the DVI port (I'm bringing a cable home to test
> >> this, but I want to use VGA for my KVM switch). Video card is an ATI
> >> Rage 128. I've read through the udev literature for a bit and am trying
> >> to understand it's workings. Does anyone have any tips that might speed
> >> up the resolution of this problem?
> >>
> >>
> > First off, it is probably not udev causing the problem. A quick test
> > would be to boot without rhgb in the boot line. This will keep
> > things in the text mood on boot, instead of the pretty graphical
> > boot display. When you edit the grub line to remove "rhgb", you may
> > also want to put a 3 at the end so you boot in the text mode. Then
> > try configuring X again.
> >
> > Mikkel
> >
> I tried what you suggested. However, the video mode is still getting
> messed up and causing the above message from the flat panel right after
> the "Starting udev" message. Following is the grub entry being used:
>
> title Fedora Core (2.6.18-1.2798.fc6) Text
>         root (hd0,0)
>         kernel /vmlinuz-2.6.18-1.2798.fc6 root=/dev/VolGroup00/LogVol00 3

Append "vga=791" to the above line. It should set the graphics adapter
to 1024x768x64K colors.

>         initrd /initrd-2.6.18-1.2798.fc6.img
>
> --
> Edward DeMeulle <ed at demeulle.org>